3-Methyl-4-(3-methyl­phen­yl)-5-(2-pyridyl)-4H-1,2,4-triazole

In the mol­ecule of the title compound, C15H14N4, the triazole ring is oriented at dihedral angles of 30.8 (2) and 67.4 (2)° with respect to the pyridine and benzene rings, respectively. The crystal structure is stabilized by C—H⋯N hydrogen-bonding inter­actions, forming chains of mol­ecules along [01]

N,N′-Bis(2-quinolylcarbon­yl)hydrazine

The title compound, C20H14N4O2, crystallizes in the ortho­rhom­bic system with a crystallographic twofold axis through the N—N bond. The mol­ecule is non-planar and the dihedral angle between two amide groups is 74.9 (2)°. An intra­molecular N—H⋯N hydrogen bond is present. In the crystal, the mol­ecules are packed in chains running along the c axis through inter­molecular N—H⋯O hydrogen bonds. These chains are further stabilized by inter­molecular C—H⋯O hydrogen bonds and C—H⋯π inter­actions leading to the formation of a three-dimensional network

3-{[Bis(pyridin-2-ylmeth­yl)amino]­meth­yl}-2-hy­droxy-5-methyl­benz­aldehyde

In the title compound, C21H21N3O2, the pyridine rings and the benzene ring lie in a propeller arrangement around the central tertiary amine N atom. The dihedral angles formed by the benzene ring with the pyridine rings are 61.0 (3) and 49.6 (3)°, while the dihedral angle between the pyridine rings is 69.7 (3)°. The mol­ecular conformation is stabilized by intramolecular bifurcated O—H⋯N hydrogen bonds. In the crystal, inversion dimers are formed via pairs of C—H⋯N hydrogen bonds

[6,13-Bis(2,4-dichlorobenzoyl)-5,7,12,14-tetramethyldibenzo[b,i][1,4,8,11]tetraazacyclotetradecinato- κ4N]nickel(II) acetone monosolvate

In the title complex, [Ni(C36H26Cl4N4O2)]·C3H6O, two 2,4-dichlorobenzoyl groups are grafted onto the methine groups of the NiII complex Ni(tmtaa) (H2tmtaa = 5,7,12,14-tetramethyl-4,11-dihydrodibenzo[b,i][1,4,8,11]tetraazacyclotetradecine). The complex has the shape of a saddle. The Ni atom is tetracoordinated by the four N atoms of the macrocycle, forming a slightly tetrahedrally distorted square-planar geometry. The metal is displaced by 0.0101 (8) Å from the N4 mean plane. The aromatic rings of the 2,4-dichlorobenzoyl groups form dihedral angles of 87.1 (2) and 82.1 (2)° with the N4 mean plan

2-(2,4-Difluorophenyl)-5-nitropyridine

In the title molecule, C11H6F2N2O2, the benzene and pyridine rings form a dihedral angle of 32.57 (6)°. The nitro group is tilted with respect to the pyridine ring by 12.26 (9)°. An intramolecular C—H...F hydrogen bond is present. In the crystal, molecules interact through π–π stacking interactions [centroid–centroid distances = 3.7457 (14) Å], forming columnar arrangements along the b axis. The crystal packing is further enforced by intermolecular C—H...O and C—H...N hydrogen bonds

Application of Ionic Liquids Containing Tricyanomethanide [C(CN)(3)](-) or Tetracyanoborate [B(CN)(4)](-) Anions in Dye-Sensitized Solar Cells

A series of novel ionic liquids composed of imidazolium, pyridinium, pyrrolidinium, and ammonium cations with tricyanomethanide or tetracyanoborate anions were prepared. The ionic liquids were characterized by NMR and IR spectroscopy and ESI-mass spectrometry, and their physical properties were investigated. Solid state structures of the N-propyl-N-methylpyrrolidinium and triethylpropylammonium tetracyanoborate salts were obtained by single crystal X-ray diffraction. The salts that are liquid at room temperature were evaluated as electrolyte additives in dye-sensitized solar cells, giving rise to efficiencies 7.35 and 7.85% under 100 and 10% Sun, respectively, in combination with the standard Z907 dye

An Internal Fluorescent Probe Based on Anthracene to Evaluate Cation-Anion Interactions in Imidazolium Salts

A series of fluorescent imidazolium-based salts contg. the cation [AnCH2MeIm]+ (in which An=anthracene and Im=the imidazolium cation) with Cl-, BF4-, PF6-, SO3CF3-, [N(CN)2]-, [N(SO2CF3)2]-, or PhBF3- anions have been prepd. and characterized. X-ray diffraction anal. of four of the salts reveals a no. of C-H•••X-type (X = O, N, F) hydrogen bonds between the hydrogen atoms from the imidazolium ring and in some cases from the anthracene ring with the electroneg. atoms of the anions. Addnl., C-H•••π interactions can be found in all the salts analyzed by X-ray diffraction, whereas π-π stacking is obsd. only in the salt contg. the phenyltrifluoroborate anion. Fluorescence emission anal. in acetonitrile shows that the fluorescence of these salts varies significantly according to the nature of the anion, and correlates to the extent of ion pairing present in soln. Photodimerization of these salts was obsd., and in one case a dimer has been isolated and characterized by X-ray crystallog